Habold l



Nov. 23,1926. 1,608,360

I *H. L. BLOOD CONTROL SYSTEM Filed August 4. 1923' IN V EN TOR.

ATTORNEYS.

lfatented Nov. 23, 1926.

UNITED STATES 15,608,360 PATENT OFFICE."

HAROLD 1). 31.001), or non'rn rmmrmnn, new JiaBsEY, ASSIGNOR TO Nines-Jan- KENT-POND COMPANY, OF NEW YORK,

N.-Y., A CORPORATION OF NEW JERSEY.

oonrnor. srsrma. 4

Application filed August 4, 1928. Serial No. 655,739.

shall insure a delay in the feeding movement at one end of the stroke of the reciprocating member. Another object of my invention is to pro vide a control system of the above indicated character that shall automatically reverse the direction of rotation of a main motor at eaih end of the stroke of the reciprocating member and operate a feed motor to effect a feeding movement and that shall insure a pmmpt feeding movement at one end of the stroke and a delayed feeding movement at the opposite end of the stroke.

A further object of my invention is to provide a control system of the above indicat-ed character that shall be provided with two main switches for operating a main mo tor in a forward and in a reverse direction and two feed'switches for operating the feed motor in a forward and in areverse direction and that shall so interlock the switches as toeffect simultaneous operation of one main and one feed switch at one end of the stroke of the reciprocating member andconsecutive operation of one main switch and one feed switch at the opposite end of the stroke of the reciprocating member.

In operating manymachine-tools having a rei'iprocating member and particularly in operating a planer, it is very often desirable to effect a feeding movementby the cutting tool at each end of the stroke of the reciprocating table. When operating a planer to effect a feeding-movement at each end of the stroke of the table, it is desirable to effect operation of the feed motor simul- 46 taneously with the operation of the main motor at the end of a return stroke. The prompt operation of the feedmotor at the 0nd of the return stroke to effect a feeding movement of the tool'can in no way spoil the 50 work which is being operated on. However,

at the end of the cuttin stroke, trouble is liable to be experienced 1f the feed motor is operated.simultaneously with the main motor without allowance for somewhat of over-travel by the'cuttingtool. By reason switches.

of the inertia of the moving parts, somewhat of drift of the table is effected after the pilot switch is operated to reverse the direction of rotation of the main motor. Account is sometimes taken of such drift, of the table by effecting a cutting o eration by the cutting tool during such dri t. If the feed motor were operated before the cutting tool reaches the end of the work, the tool would be moved transversely while effecting a feed- 65 ,ing cut; 'The moving of the cutting tool across the work While effecting a cut is liable to spoil the work being operated on.

'In a control system constructed in accordanre with my invention, the feeding operat on is effected, promptly at the end of the return stroke of the table and is delayed at the end of the cutting stroke. The system is provided with two main switches, two feed switches, and the usual accelerating One of the feed switches is interlocked with one of the main switches in order to prevent the operationfof such feed swit h at the end of the cutting stroke of the planer table until after the operation of the main switch. By such means, a delayed operation of the feeding movement is effected at the end of the cutting stroke.

In the accompanying drawing: Figure 1 is' a front elevational view of 95 a planer adapted to be operated in accordance with my invention. Fig. 2 is a diagrammatic view of acontrol system constructed in accordance with my invention.

Referring to Fi 1 of the drawing, a planer is illustrated having a bed 1, a table 2 and uprights 3 for supporting a cross rail 4. The table 2 is reciprocated by a main motor 5 which is connected to the table by suitable gearing 6. The cross rail 4, which is mounted on the'uprights '3, carries a tool head .7 which in turn carries a cutting tool 8'. y A feed motor 9 is operated on the arch (not shown) of the planer. The feed motor 100 '9 is connected to a shaft 10 for eifecting feeding and traversing operations of thecutting tool in a well known manner; Fora more complete descri tion of the mechanical construction of the 'p aner, reference may be 10.5 had to the patent to Greenle-af and Keefer, No. 1,299,192, dated April 1, 1919. i U on the bed 1 'of'the planer is mounted 9. pi ot switch 11 which controls the opera- .-tion not only of the main motor 5 but also of no the feed motor 9. The pilot switch 11'-is operated by two movable dogs 12 and 13 which are. mounted on the table 2. At the end of the cuttin stroke of the table, the

dog 12 engages a Tever 14 for operating the pilot switch 11 in one direction. 'At the end of the return stroke, the do 13 engages a lever 15 for operating the pi of switch in an opposite direction. The levers 14 and 15 are connected to the pilot switch 11 bylinks ,16.

Referring to Fig. 2 of the drawing, the

main motor 5 is shown comprising a shuntfield-magnet winding 17, a series field-magnet winding 18, an emergency winding 19 similar inevery way to the emergency wind-- ing shown and described in the patent to Foster 1,252,897 granted January 8, 1918, a commutator winding 20, and an armature 21.

The feed motor 9 comprises an armature 22,

a series'field-magnet winding 23, and a shunt field-magnet'winding 24. The main motor 5'is controlled by two main magnets and 26 and two accelerating magnets 27 and 28. The feed motor 9 is controlled by two feed magnets 29 and 30 and one accelerating magnet 31. A suitable circuit breaker 32 is provided for preventing operating of. the

system under over-load and low voltage circuit conditions.

A pendent switch 33 is provided for operating the main and the feed motors at will and for insuring against any automatic operatlon of such motors, during the manual operation. A limit switch 34 is provided for limiting the feeding movements of the mo tor 9. An accelerating resistor 35, which is controlled by the accelerating switches 27 and 28, is provided in the circuit of the main motor 5. An accelerating res stor 36, which is controlled by the accelerating switch 31, is provided in the circuit of the feed motor 9. A dischar e resistor 37 is provided across the shunt fiel -ma et winding 17 to cushion the effect of breaklng of this shunt field magnet windin and a dynamic-brakin resistor. 38 is provided in the circuit of tie feed motor9.

The main switch 26 comprises a pivotally mounted switch arm 39 having two contact members 40 and41 mounted thereon. In the released position of the switch arm 39, the contact member 41 engages a stationary contact member 42 andin the operative position of the switch arm, the contact member 40 engagesa stationary conta ct member 43. The 1 switch arm 39 carriesanother contact member 44 whlch 1s adapted to engage a stationary contact member 45 when the switch arm is inva'n operative position. The engagement between the contact members 44 and 45 serves to completes. circuit for effecting operation of the accelerating switches 27 and 28. A

main 'magnet "46 is provided for operating the switch arm and a holding magnet 47 is 7 arm 66.

provided for preventing operation of the switch arm when the main switch 25 is operated and when a dynamic-braking current is flowing throughthe main motor 5. The

"main switch 26 serves to operate the main motor 5 for efi'ecting a cutting stroke-by the planer.

The main, switch 25 comprises a pivotally" arm when the main switch 26 is operated and when a dynamic-braking current 1s flowing throu h the main motor. A pin 56, which pro ects from the side of the switch arm 48, is adapted to open a switch 57 when the switch 25 is operated. The switch 57 serves normally to short circuit a resistor 58. However, upon operation of the switch arm 48 to open the switch 57, the resistor 58 is connected with a resistor 59 in circuit with the shunt field-magnet winding 17 The resistors 58 and 59, which are thus included in circuit with the shunt field-magnet wind-v ing 17, serves to efie t a relatively rapid return stroke by the p aner table.

The accelerating switch 27 comprises a pivotally mounted switch arm 60 having a contact member 61 and an insulated contact member .62 mounted thereon. In the re leasedposition of the switch arm. the contact member 62 bridges two stationary con;

tion of the switch arm, the contact member 61 engages a stationary contact member 64. A magnet 65 is provided for effecting op eration of the switch arm 60'.

The accelerating switch 28 comprises a ivotally mounted switch arm 66- having a contact member 67 and an insulated contact member 68 mounted thereon. The insulated contact member 68 is adapted to bridge stationary contact members .69 in the released position of the switch arm. The contact member 67 is adapted. to engage a stationary contact member 70 in the operative position of the switch arm. A magnet 71 is providedfor The 'feed I switch 29 comprises two pivotally mounted switch arms 72 and 73, which operating the switch are connected together by means of a link 74. The switch arm 73 carriesa contact member 75 and the switch arm 72 carries two contact members 76 and 77. In the re- :tact members 63 and in the operative p osi- .7 6 are adapted, respectively, toeng leased position of'the switch arms, the ,con-' tact. member 77 en ages astationarycontact member 78. Int e' operative osition of the switch arms, the contact mem rs 75' and fie stationary contact members 7 9 and 80. a magnet 81 is provided for eifecping operation of the switch arms and a holding coil 82 is 7 provided for preventing operation of the switch arms when a dynamic-braking current is flowing through. the feed motor 9.

The feed switch 30 comprises two pivotally mounted switch arms 83 and 84 which are connected together by a link- 85. The

switch arm 84 carries a contact member-86 and the switch arm 83 carries twocontact members 87 and 88. The contact member 88 is adapted to engage a stationary contact member 89 in the released position of the switch arms and the contact members 86 and 87 are respectively adapted to engage Sta-- tionary contact members 90 and 91 in the operative position of the sw1tcl1 arms. A magnet. 92 is provided for effecting operation of the switch arm 83 an'la holding coil 94 is provided for reventing-operation of the switch arms wien a'dynamic-braking currentis flowing through the feed motor 9.

'l' he accelerating switch 31 comprises a switch arm 95, having acontact member- .96 mounted thereon. The contact member 96 engages a stationary contact member 97 in the operative position of'the switch arm.

A magnet 98 is provided for etiecting pcration of the switch arm '95. "lhe'pilot switch 11 comprises three contact segments 100,101 and 102. Thecontact. segnien't 100 is adapted to engage contact fingers 103 to 106 .*inclusive, for controlling the operation of the feed switches 29 and 30. The contact segment 101 is adapted to engage stationary contact fingers 107 to 110. inclusive, for controlling the operation of the accelerating switches 27 and the feed motor-9 under certain conditions. The rod 123 carries two contact segments 125 and 126. In the position shown in' the drawing, the contact segment 125 bridges the contact members 127 and 128 to completea circuit for operating the accelerating switches 27 and 28. The contact segswitches 27 and 28 by the An arm 156 is ment 126 bridges the contact'members' and 130jforfpermitt1ng operation of the mainswitc'hes 25 and 26, by means of the pilot switch 11. Upon moving the rod 123 upward, the contact segments 12 and 126 disengage the contact members to prevent any automatic operation of the main switches and 26 or the accelerating ilot switclf 11. In the upper position of t e rod 123, the contact segment 126 maybe "turned in one direction for bridging contact members 131 and 132 to effect operation of the main switch 26 or may be moved in an opposite direct-ion for bridging contact members 133 and'134 to efiect operation of the main switch 25.

The rod 124 carries two contact segments 135 and 136. In the lower position of the rod 124, the contact segment 135 bridges contact members 137 and 138 to complete a circuit for effecting operation of the accelerating switches 27 and 28 by means of the pilot switch .11. The contact segment 136, in the lower positionof the rod 124, bridges contact members 139 and 140 for permitting operation of the main switches 25 and 26 by means of the pilot switch. A third contact segment 141 is provided on the rod 124101 bridging contact fingers 142 and 143 in the lower position of the rod 124. The contact segment 141 completes a ortion of a circuit for effecting operation of the feed switch by means of-the pilot switch 11. Inthe raised position of the rod .124, the contact segnients'135, 136 and 141 disengage. the contact members to prevent operation of the main switches, the accelerating switches, and the feed switches by the pilot switch 11. \Vhen the rod 124 is in the raised position, the contact segment 136 may be turned in one direction for bridging contact fingers 145 and 146 to effect operation'of the feed switch 30. The contact segment. 136 may be moved in "an op osite direction for bridging contact mem ers 147 and 148 to cited operation of the feed switch 29.

The circuit. breaker 32 comprises two switch arms 150 and 151 which are adapted to be connected to the supply conductors 152 and 153. An overload coil 154 and a low voltage coil 155 are provided for opening the circuit breaker to protect the system.

provided for engaging contact members 15 and 160, inclusive, to complete an. emergency braking circuit upon re. lease of the circuit breaker.

At the end of the returustroke of the planer table 2, the dog 13 engages the lever 15 for operating the pilot switch 11 to move the contact segments 102,101 and 100 in a clockwise direction, as shown in Fig.2 of the drawing. The contact segment 102 bridges the contact: fingers 111 and 112 for completing. a circuit to operate the main switch 26. The circuit completed by the contact segment 102 extends from the supply conductor 153 through switch arm 151,

series winding 18, holding coil 55., contactextends fromthe supply conductor 153 through switch arm 151, series field-magnet winding 18, holding coil 55, contact members- 51,. 49, switch arm 48, accelerating resistor 35, winding 20, armature 21, switchv arm 39, contact members 43 and 40, coil 154. and theswitch arm 150 to the supply conductor 152. The motor-5 is operated in a direction to effect a. cutting stroke by the planer.

The contact segment 101 bridges the con-v tact fingers 109 and 110 for effecting opera-' tion of the accelerating switches 27 and 28 by the counter electromotive force developed by the main motor 5. The circuit for operating the accelerating switches extends from one terminal of the armature 21 through the switch arm 39, contact members 44 and 45, magnets 65 and 71 of the accelerating switches in parallel, contact members 127 and 128, which are bridged by the contact segment 125, contact fingers 137 and 138, which are bridged by the contact segment135, contact fingers 109 and 110, which are bridged by the contact segment 101, and the winding 20 to the other terminal of the armature 21. The accelerating switches 27 and 28 are'successively operated to short cir-' cuit portions of the accelerating resistor 35 from the circuit of the main'motor 5. One

- of the switches 27 and 28 may be rendered slow acting by lengthening the air gap between the pole and the armature thereof.

lrior to the operation of the accelerating switches 27 and 28, the shunt field-magnet r winding 17' is connected across the supply conductors 152 and 153 by a circuit which extends from the supply conductor 153 through switch arm 151, winding 17, contact members 63, which are bridged by the contact segment '62, winding 154, and the switch arm 150 to the supply conductor 152. Upon operation of the accelerating switch 27 the circuit of the shunt field-magnet.

I winding 17 extends through the. resistor 59,

switch 57, coil 154, andthe switch arm 150 to the suppl conductor 152.

Upon bri ging of the contact fingers 105 and 106 by the contact segment 100, a circuit is completed for opcra't-in the feed switch 29." The circuit through tie-magnet'off 'tfhe feed switch 29extcnds'from the supply eonductor 153 through the switch arni'151, field-' magnet winding 23, coil 81, contact fingers 121 and 122, which .are bridged by the contact segments117 and 118, contact fingers 105 and 106, which are bridged by'the contact segment 100, contact fingers 140, 139,

which are bridged by the contact segment 136. contact lingers 129 and 130,-which are u bridged by the contact segment 126, winding 154, and the switch arm 150 to the supply conductor 152. The energizing circuit for the magnet of the feed switch 29 is connected dircctlyacross the supply conductor 152 and 153 at theend of the return stroke.

Accordingly, a prompt feeding operation of the motor 9 is efl'ected. Moreover, it will he noted the feed switch 29 operates simultaneously with the main switch 26.

Thecircuit completed through the feed motor 9 extends from the supply conductor .153, through the switch arm 151, series fieldthe energizing circuit for the'magnet 81.

At the end of the cutting stroke,-the dog 12 on the table 2 engages the lever 14 to reveise the position of the pilot switch 11. The contact segments 102, 101 and 100 are given a movement in a counter clockwise direction,uas shown in Fig. 2 of the drawing.

" The contact segment 102 disengages the contact fingers 1.11 and 112 and bridges the contact'fingers 113 and 114. The contact segment 101 disengages the contact fingers 109 and 110 andbridges the contact fingers '107 and .108. The contact segment 100 disengages the contact fingers 105 and 106 and bridges the contact segments I03 and 104. Upon separating the contact segment 102 from the contact fingers 111 and 112, the

energizing circuit for the magnet 46 of the main switch 26 is opened to release the switch 26. 'Thereupon, a dynamic-braking circuit is completed through the main motor 5. The dynamic-braking circuit extends from .one terminal of the armature 21 through switch arm '39, contact members 41 and 42, coil 47, coil 55, contact members 49 and 51, switch arm 48, resistor 35, and winding 20 to the other terminal of the armature 21. 1

The bridging of the contact fingers 113 2, contact members 76 and 80, resistor 36,

b 54 of the main switch 25.

' the contact segment 126, winding 154, and

switch arm 150 to the supply con uctor 152. A circuit is completed through the main motor for operating such motor to effect a return stroke of the planer. v.

The circuit completed by the switch 25 through the main motor 5 extends from the supply conductor 153 through the switch arm 151, series field-magnet winding 18,

holding coil 47, cont-act fingers 41 and 42,

switch arm 39, armature 21, winding 20, resistor 35, switch arm 48, contact members '50 and 52, winding 154 and the switch arm 150 to the supply conductor 152.

The switch arm, 48 of the main switch 25 opens the switch 57 to insert the resistor 58 in circuit with the shunt field-magnet winding 17 The inserting of the resistor 58 with the resistor 59 in circuit with the shunt fieldmagnet winding increases the speed of the return strokej J The bridging of the contact fingers 107 and 108 by the'contact segment 101 completes a circuit through the magnets of the acceleratin switches27 and 28. The circuit throug the magnets of the accelerating switches extends from one terminal of the armature 21 through the switch arm 39, switch 53, magnets 65 and 71 in parallel,

contact fingers 127. and 128, which are of the armature 22 through the switch arm bridged by the contact segment 125, contact fingers 137 and 138, which are bridged by the contact segment 135, contact fingers 109 and 110, which are bridged by the contact segment 101, and the winding 20 to the other terminal of the armature 21. The accelerating switches are operated to short circuit the accelerating resistor 35.

The separating of the contact segments 117. and 118 from the contact fingers 121 and 122 releases the feed switch 29 to complete a dynamic-braking circuit. The dynamicbraking circuit extends from one-termmal 72, contact fingers 77 and 78, resistor 38,

contact fingers 88 and 89, and the switch arm 83 to the other terminal of the armature 22. The magnets 82 and 94 are connected across the dynamic-braking circuit to prevent operation of the feed switch 29 or the feed switch 30 until the braking current ceases to flow.

Upon bridging of the contact fingers 103 members 49 and 51, switc and 104 by the contact segment 100, a circuit is complleted for operating the *feed' members 50 and 52,-winding 154, and switch.

arm 150 to the supply conductor 152. It will be noted the above circuit for energizing the magnet 92 of the feed switch 30 ex tends through'the main switch 25 and ac- .cordingly it is imipossible to operate the feed switch 30 to e ect a feeding operation at' the end of the cutting stroke until after the operation of the main switch 25. Ac cordingly, it is apparent a delayed feed 'is' effected at the end-of the cutting stroke. It will also be noted that such circuit extends through the contact segment 141 of the pendent switch to prevent the closing of the circuit when the rod 124 of the pendent switch is in a raised position.'

The circuit completed through the feed motor extends from the supply conductor 153 through the switch arm 151, series fieldmagnet'wmding 23, contact members 86 and 90-, switch arm 84, armature 22, switch arm 83, contact members 87 and 91, resistor 31,

winding 154 and the switch arm 150 to the supply conductor152.

The above cycle of operations is automatically efl'ected under the control of the pilot switch 11. In case it is desired to operate the main motor 5 at will, the rod 123 of the pendent switch 33 is raised to separate the contact segment 126 from the contact members 129 and 130 and to separate the contact segment 125 from the contact fingers 127 and 128. As heretofore set forth, the separating of the contact segments 125 and from such contact fingers prevents the automatic operation of the main switches 25 and 26, the automatic operation of the feed switches 29 and 30, and the operating of the accelerating switches 27 and 28. If the rod-123 is raised and the contact segment 126 is turned toward the right, as shown in Fifigr; 2 of the drawing, to brid the contact gers 131 and 132, a circuit is completed for operating the main switch 26. The circuit throu h the ma nct of the main switch 26 exten s from the. supply conductor 153 through the switch arm 151, series winding 18, holdin coil 55, contact arm 48, magnet 46..eontact fingers 131 and 132, which are bridged by the contact segment 126, winding 154 and the switch arm 150 tothe supply conductor 152. i

N The moving of the contact segment 126 towards the left, as shown in 2 of the drawings, bridges the contact gers 133 and. 134 for operating the main switch 25. The ener izingcircuit for the main switch exten s from the supply conductor 153.

through the switch arm 151, series winding 18, holding coil 47, contact fingers 41 an a 42, switch arm 39, magnet 54, contact fingers 133 and 134,. which are bridged by the contact segment v 126, winding 154, and the switch arm 150 to the supply conductor 152. The ;rod.124 of, the pendent switch, as heretofore set forthyserves to effect operation of the feed motor 9 at will. The mov-' switch through the main switch 25-. As-

suming'the rod 124 to be in theraised position, a circuit is completed for operating the feed switch 30'when the contact segment 136 is moved towards the right, as shown in Fig. 2 of, the drawing. The circuit through the magnet 92. of the feed switch 30 extends drawing, the contact fingers 147 and 148 are:

i as

l plylconductor 152. y

from the supply conductor 153 through the switch arm 151, series winding. 23, magnet 92,.conta'ct fingers-145 and 146, which are bridged by the contact segment 136, winding 154 and the switcharm 150 tothe suppon moving the contact segment towards the left, as shown'in Fig.2 of the bridged by the contact segment 136 for completin 'a circuit to operate the .feedflswitch 29. e circuit through-the magnet 81 of thefeed switch 29 extends from the supply conductor 153 throughthe' switch arm 151, series winding 23, magnet 81 contact fingers 147 and'148, contact segment 136, wind- 1ng'154, and the switch arm 150 to the supplyconductor 152.

Modifications in the system and in the arrangement and location of parts may be made within the spirit and scope of my in vention and such modifications are intended to be covered by the appended claims.

What I claim is:

1. In a control system for a machine tool,

the combination with a reciprocating memher, a main motor-for operating the reciprocating member, and a feed motor for effecting feeding movements of the cutting topl, of means for automatically operating said motors in accordance with the movement of the reciprocating member, and means for varying the time of operating the feed motor with respect to the time of operating the main motor according to the direction of movement of the reciprocating member.

' member, and means for automation v 2. In a chntrol system for a machine tool,

thecombination with a reciprocating memfecting feeding movements,- of means for antomatically operating. the feed motor at each end ofthe stroke of the reciprocating ly delaying the operation of the feed motor at one end 'of the stroke of the reciprocating member. I

3. In a control system for a machine tool,

the combination with a reciprocating member,'a cutting tool, a main motor for o rating the reciprocating member, and a eed motor "for effecting feeding movements of the cutting tool with respect to the -reciprocating member, ofemeans for automatically operating the feed motor at each end of thestroke .ot ,the reciprocating member, and means for automatically dela yin the operation of the feed motor at the en of the cuttingstroke of the reciprocating member.

4. In a controlsystem for a machine tool, the combination with a reciprocating member, a main motor for operating the reciprocating member, a-cuttin'g tool, and a feed motor for efiecting feeding movements of the tool, of means controlled by the reciprocating member for operating the main motor and for effecting movement of the feed motor at eachend of the stroke of the reciprocatin member, and means for automatically de aying the feeding movement ,of the feed motor at one end of the stroke of the reciprocatin member.

' 5. In -a controIsystem for a machine tool, the combination witha reciprocatingmember, a main motor for operating the reciprocating' member, and a feed motor, of means comprising two switc members for o crating each of a single portable switch having the motors at will,means or operating the main motor in accordance with the movement of the reciprocating member and for automatically operating the feed'motor at each end of the stroke of the reciprocating member, and means for automatically-(1e laying themovementof the feed motor at one'end of the stroke of the reciprocating inemben:

6. In a control system for a machine tool,

the combination with a reciprocatin member, a main motor for operating. said reciprocating member, a cuttln'g tool, and a feed motor for operating the main motor in accordance with theoperation of the reciprocating member and for automatically operating the feed motor at each end of the'stroke of the reciprocating member, and means for automatically dethe cutting tool with .respect to the rec1procating-member, of

, laying the movement of the feed motor at one end of the stroke of the reciprocating member. v

7. In a control system for a machine tool, the combination with a reciprocatin member, amain motor for operating sai recip-- trolling the operation of the feed motor, of

means comprising a movable switch for controlling the operation of the main and feed switches at will, means for operating the main motor in accordance witlrthe operation of the reciprocating motor and for auto-' matically operating the feed motor at each end of the stroke of the reciprocating member, and means for delaying the movement of the feed motor at one end of the stroke of the reciprocating member.

8. In a control system for a planer, the combination with a reciprocating table, a main motor for operating saidtable, and a feed motor, of means for operating the main motor in accordance with the operation of the table, and automatic means for automat ically effecting movement of the feed motor at each end of the table stroke, the operation ofthe feed motor being effected promptly at one end ofthe stroke and delayed somewhat at the other end of the table stroke.

9. In a control system for a planer, the combination with a reciprocating table, a main motor for operating said table, a cutting tool, and a feed motor, of means for operating the main motor in accordance with the table movements and for automatically effecting a feeding movement of'the feed motor at each end of the table stroke, and automatic means for delaying the movement of the feed motor at the endof the cutting stroke of the table and for effecting a prompt movement of the 'feed motor at the end of the return stroke.

10. In a control system for a planer, the combination with a reciprocating. table, a main motor for operating said table, and a feed motor, of means comprising a portable switch having two switch members for operating said motors at will, and automatic means for operatingthe main motor in accordance with the table movement and for operating the feed motor at each end of the table stroke, the operation of the feed motor being effected promptly at one end of the table stroke anddelayed somewhat at the other end of the table stroke.

1]. In a control system for a planer, the combination with a reciprocating table. a main motor for operating the table, a cutting tool, and a feed motor for effecting ment of the feed motor at the end of the cutting stroke and for effecting a prompt movement of thefeed motor at the end of the return stroke, and means comprising a portable switch having two switch members for controlling the operation of the two motors at will.

12. In a control system for a machine tool, the combination with a reciprocating member, a main motor for operating the reciprocating member, two main switches for operating the main motor in a forward and in a reversedirection, a feed motor, and two feed switches for operating the feed motor in a forward and in a reverse direction, of means for automatically operating said switches to reverse the main motor at each end of the stroke of the reciprocating men her and to ell'ect a feeding movement of the feed motor, and means for delaying the operation of one feed switch at one end of the stroke and for elfecting a prompt operation of the other feed switch at the other end of the stroke.

13. In a control system for a machine tool,

the combination with a reciprocating member, 21 main motor for operating the reciprocating member, two main switches for operating the main motor in a forward and in a reverse direction, a feed motor, and two feed switches for controlling the feed motor, of means for .operating one of the main switches and one of the feed switches simultaneously at one end of the stroke of the reciprocating member and for operating a feed switch after the operation of a main switch at the opposite end of the stroke of the reciprocating member.

14. In a control system for a machine tool,

the combination with areciprocating member, a main motor for operating the reciprocating member, two main switches for operating the main motor in a forward and in a reverse direction, a feed motor, and two electro-magnetic switches for operating the feed motor in a forward and in a reverse direction, of means for operating the main switches to reverse the main motor at each end of the stroke of the reciprocating member, and means for energizing one of the feed switches through one of the main magnets to obtain a delayed feeding operation at one end of the stroke of the reciprocating member.

In testimonywhereof. I hereto aflix my signature.

H ROLD L. BLOOD. 

